West Yorkshire police said on its website that Thomas Mair, 52, had been charged with the murder of the 41-year-old mother of two.

"We have now charged a man with murder, grievous bodily harm, possession of a firearm with intent to commit an indictable offense and possession of an offensive weapon," West Yorkshire Police Detective Superintendent Nick Wallen said in a statement.

Lawmakers pay tribute to Jo Cox:

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Britain pays tribute to slain lawmaker Jo Cox

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Britain pays tribute to slain lawmaker Jo Cox

Prime Minister David Cameron and Labour Party leader Jeremy Corbyn lay flowers while Shadow foreign secretary Hilary Benn and Commons Speaker John Bercow look on in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

Flowers left at Parliament Square opposite the Palace of Westminster, central London, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Flowers left at Parliament Square opposite the Palace of Westminster, central London, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Labour Party leader Jeremy Corbyn (centre) speaks to the media during an impromptu vigil at Parliament Square opposite the Palace of Westminster, central London, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

People hug each other during an impromptu vigil at Parliament Square opposite the Palace of Westminster, central London, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

A message left by Mary Creagh in Birstall, West Yorkshire, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in the town.

Labour Party leader Jeremy Corbyn and deputy leader Tom Watson (rear) arrive to leave tributes at Parliament Square, opposite the Palace of Westminster in central London, following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

A woman lays some flowers at Parliament Square opposite the Palace of Westminster, central London, in tribute to Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

A woman lays some flowers at Parliament Square opposite the Palace of Westminster, central London, in tribute to Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

People stop to look at tributes left at Parliament Square opposite the Palace of Westminster, central London, in respect to Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

People writing messages of tribute at Parliament Square opposite the Palace of Westminster, central London, in respect of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Tribute messages at Parliament Square opposite the Palace of Westminster, central London, in respect of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

People look at tributes at Parliament Square opposite the Palace of Westminster, central London, in respect of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Mary Creagh (left) and Caroline Flint (second right) leave St Peter's Church Birstall, West Yorkshire after a vigil following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

A general view of a sign for Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

Floral tributes are left in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

Yvette Cooper (second left) leaves St Peter's Church Birstall, West Yorkshire after a vigil following the death of Labour MP Jo Cox, who died after being shot and stabbed in the street outside her constituency advice surgery in Birstall, West Yorkshire.

The Union flag at half-mast on top of Portcullis House, London, with Queen Elizabeth Tower in the background, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Labour party general secretary Iain McNicol (right) and John Cryer MP leave floral tributes in Parliament Square, London, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery in Birstall, West Yorkshire.

Reverend Paul Knight, the vicar of Birstall, reads messages of condolence written by Prime Minister David Cameron and Labour Party leader Jeremy Corbyn in a book of remembrance for Jo Cox in St Peter's church in the West Yorkshire town, after the Labour MP was shot and stabbed to death outside her constituency advice surgery.

Previously unissued picture dated 21/11/2006 of Jo Cox (red scarf), Andrew Mitchell (centre left) and David Cameron (centre right) during a visit to Darfur in the Sudan as part of the Conservative leader's two day tour of the region.

Left to right: Shadow foreign secretary Hilary Benn, Commons Speaker John Bercow, Prime Minister David Cameron, Speaker's chaplain Reverend Rose Hudson-Wilkin and Labour Party leader Jeremy Corbyn arrive to lay flowers in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

Prime Minister David Cameron and Labour Party leader Jeremy Corbyn lay flowers in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

Labour Party leader Jeremy Corbyn speaks to the media after he and other senior politicians laid flowers in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

People lay flowers in Birstall, West Yorkshire, after Labour MP Jo Cox was shot and stabbed to death in the street outside her constituency advice surgery.

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Mair was due to appear at Westminster Magistrates' Court on Saturday, Wallen said.

Cox, a supporter of Britain staying in the EU, was shot and stabbed on Thursday by a man who witnesses said shouted "Britain first," in her own electoral district near Leeds in the county of West Yorkshire in northern England.

Wallen said Cox "was attacked and sustained serious injuries from both a firearm and a knife and despite assistance from passers-by, the ambulance service and police officers who were quickly on the scene, she sadly died of her injuries."

Wallen said the suspect was quickly apprehended thanks from help to the public.

He said police, working with the North East Counter Terrorism Unit, was pursuing inquiries into media reports of "the suspect being linked to right wing extremism" and "the suspect's link to mental health services."

"Based on information available at this time, this appears to be an isolated, but targeted attack upon Jo - there is also no indication at this stage that anyone else was involved in the attack. However we will be investigating how the suspect came to be in possession of an unlawfully held firearm," Wallen added.

He said, however, that police were working with the Palace of Westminster and the Home Office to review security arrangements for members of parliament.